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Convert Binary Variable to Base64

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Posted on by RVF99

Hi,

I'm creating a desktop flow in which I need to to convert a Binary Variable to base64.

I'm extracting this binary data from a Dataverse Table.

Using the action "Download a file or an image from selected environment", it creates an Binary Variable with the following content:

However, when I try to use a PowerShell script to convert the Binary data:

# Convert a binary variable to base64
$binaryVariable = %GetEntityFileImageFieldContentWithOrganizationResponse%

# Convert the binary data to a Base64 string
$base64String = [Convert]::ToBase64String($binaryVariable)

# Output the Base64 string
Write-Output $base64String

I get the following error:

Byte : The term 'Byte' is not recognized as the name of a cmdlet, function, script file, or operable program. Check
the spelling of the name, or if a path was included, verify that the path is correct and try again.
+ $binaryVariable = Byte [65747]

Could you help me?

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Power Automate Desktop

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Nived_Nambiar 18,136 Super User 2026 Season 1 on at

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Hi,

Instead of powershell- could you try this way ?

1. download file from dataverse table using download file or image file from dataverse table

2. Convert the binary data from dataverse action to file using convert binary to file action.

3. Convert the file to base64 using convert file to base64 action

see the flow below

See whether this helps ?

Thanks & Regards,
Nived N
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RVF99 36 on at

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@Nived_Nambiar

Thanks for your suggestion!

Yes, I've tried this workaround and it works.

But the idea is to avoid creating a local file and having to delete it later. That's why the file is stored in Dataverse.

Kind Regards,

RVF

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RVF99 36 on at

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Hi,

I found an solution using .NET instead of PowerShell.

The Binary Variable is an Binary Object Type: Microsoft.PowerPlatform.PowerAutomate.Desktop.Actions.SDK.Types.BinaryObject
Microsoft Documentation: Learn Page

Here is the code below:

import System.IO byte[] binaryData = BinaryVariable.Data; Output = Convert.ToBase64String(binaryData);

Where BinaryVariable is an dynamic input type
Output is string.

Kr,

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Nived_Nambiar 18,136 Super User 2026 Season 1 on at

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Good to know issue is resolved !

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